Strapon ?
 

I would like my wife to use a strapon dildo on me, dont know why its just something I would like to try, how could I approach the subject, I use dildos and vibrators on her and i am really wanting to have a go myself

First, you click the search button and do a search for "strapon". Then you look at all the results where we've actually discussed this a lot. Like in this thread or this thread.

Then you figure out why you can't have this conversation with her if you're already fucking her in the ass. Obviously you don't have a problem discussing doing her, so why is it a problem to discuss her returning the favor? That, to me, seems to be the big problem here.

you can get some good information here

http://www.tfproject.org/tfp/showthread.php?t=123174

it also has another link to another discussion about it :)

oops Jazz beat me to it

*post removed by Xeph*

In the past a Lover wishing to try anal sex on myself bought a strap on and told me what he wanted. He offered himself saying that he couldn't put me through it before knowing what it felt like. I thought it was incredibly thoughtful of him, which I am sure was the intention. We had a good time nonetheless.